A book placed on a table is at rest is the force of a friction acting on it or not ? Explain?
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No untill or unless when no force will applied on . Hence as we know that friction only apply when the force will also applied.
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When a book is placed on the flat surface of a table, the frictional force acting between the surfaces of the table and the book is active.
This frictional force is responsible for holding the book in place, exactly where it was kept. In the absence of this force, the book would have simply slipped out of the table.
This frictional force is present in all types of smooth and rough surfaces that bind one surface to another.
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